Or teams have a general idea where a player is AND where he fits, that is, some players like Couts can be worked in the bottom six then work their way up, other offensive first players have to have instant success on scoring lines or they're worse than replacement value.
Not saying teams don't make mistakes in hindsight, but it's not an exact science.
It also makes sense to be more cautious with top prospects, if you screw up Rubtsov you might lose a solid two way center, if you screw up Vorobyev you might be losing the services of a marginal NHL player.
To me, the most important thing this year is to set up Frost, Farabee, Rubtsov and Myers for success, to gradually integrate them in the team, and hopefully by the playoffs (see the Pens Cup teams) they're ready to contribute, and you can write them in ink next season in the lineup card.
Cameos are more valuable for guys like Bunnaman, Twarynski, NAK, Sushko and Vorobyev, because their future, if any, is as bottom six players who have to understand what that role entails at the NHL level - it's about accepting your limits and embracing "dirty work."